Given the horror/adult genre of many of his works and the crazy number of titles he's published over the years, this makes sense

Some 80% of bans occur in three states: Florida, Texas, and Tennessee.

While states like Maryland, New Jersey, and Illinois do not appear to ban books in schools.

I grew up decades ago and remember some books being banned at my school library, even though it probably wasn't officially on a list somewhere to be tabulated and counted. I think the reality of what isn't allowed in schools goes far beyond these stats.

The 80/20 rule usually applies to large numbers & the 3 states you list represent 15-20% of US student population and 80% of bans.

"The Library Policeman" should probably be for 14-16+ yo's along with "Howl".

Banning outright reeks of censorship and fragile, anti-intellectual insecurities.

“Banned” just means the school library chooses not to buy it.

You can still get them at the public library or any bookstore.